JP4308977B2 - Manufacturing method of laminated display sheet and laminated display sheet obtained thereby - Google Patents

Description

[0001]
TECHNICAL FIELD AND PRIOR ART
The present invention relates to a laminated display sheet having a display area that can be concealed. A predetermined display area on the surface of the base material is always shielded by a surface-side concealing layer or the like on a label or card, and the concealing layer is peeled off as necessary to read the display on the base material. Such a composite display label, or a so-called tamper-evident prevention label or the like in which it is known that there has been an illegal tampering action due to such peeling is widely known and put into practical use.
[0002]
Problems to be Solved by the Invention
In these labels, the label substrate or the like is always covered with a surface-side concealing layer so as not to be seen from the outside, and is displayed by peeling off this layer. As this kind of label, various types of structures are known for the structure of the release surface provided in the laminate, etc., but it is surprising and rich in appearance when the hidden internal display appears, In addition, it is desirable to have a more effective function for preventing unauthorized opening and tampering.
[0003]
In addition, it is desirable that the display surface after peeling off the concealing layer does not leave a mark on the display surface and damage the appearance of the product, or that the display surface is sticky and does not cause dirt or handling problems. .
[0004]
[Means for Solving the Problems]
According to the present invention, the laminated display sheet used for such a label is subjected to roughening treatment such as sand blasting on the surface of a film substrate made of a transparent thermoplastic resin to form an opaque region, and the opaque display sheet. A transparent resin ink is printed in a predetermined pattern on a part of the transparent region to form a transparent region by smoothing the rough surface, and a transparent material having a lower melting point than the film substrate is formed on the surface of each region. A thermoplastic resin is supplied in a molten state, then cooled and solidified to form a surface protective layer releasably bonded to the film substrate, and is produced by a method for producing a laminated display sheet.
[0005]
According to the manufacturing method of the present invention, the opaque region formed by roughening treatment such as sandblasting on the surface and the transparent resin ink is printed on a part of the opaque region with a predetermined pattern. Surface protection formed by detachably bonding a film substrate made of a transparent thermoplastic resin having a transparent region and a transparent thermoplastic resin having a melting point lower than that of the thermoplastic resin of the film substrate to the region A laminated display sheet having a layer and potentially including a display portion produced by contrasting the opaque region and the transparent region on the surface of the film substrate.
[0006]
The surface of the transparent film substrate of this laminated display sheet is made opaque as a whole by sandblasting, and the roughened surface by sandblasting is smoothed in the portion where the transparent resin ink is printed in this opaqueness region to become a transparent region. The display pattern is formed by contrast with the surrounding opaque area. When the thermoplastic resin serving as the surface protective layer is supplied to both regions in a molten state and bonded to the film substrate, the roughened portion of the opaque region around the display pattern is caused by the molten resin. As with the transparent region, the surface is smooth and uniformly transparent, and the sheet has a transparent appearance as a whole.
[0007]
In this state, the predetermined pattern of the display part (transparent area) on the film base material has disappeared, but when the holding protective layer is peeled off from the film base material, the rough surface of the opaque area again becomes visible. The predetermined display pattern is reproduced by comparing the opaque region and the transparent region which have been exposed.
[0008]
In a preferred embodiment of the present invention, the surface protective layer may be formed of a thermoplastic resin having a melting point lower than that of the transparent film base resin alone on the surface of the film base by melt extrusion or the like. It is also possible to form a thermoplastic resin by extruding it in the molten state between the film substrate and the transparent protective film as a coating bond layer. In this case, the cooled thermoplastic resin is detachably bonded to the film base material and is detachably bonded to the protective film.
[0009]
As the transparent film substrate, for example, a transparent film of a thermoplastic resin made of polyester such as polyethylene terephthalate or oriented polypropylene is suitable. Further, as the thermoplastic resin of the surface protective layer that is supplied in a molten state to the surface of the film base material and is detachably bonded, a transparent resin whose melting point is lower than that of the thermoplastic resin forming the film base material is used. For example, when the film substrate is polyethylene terephthalate, polyethylene or the like is preferable.
[0010]
If a normal transparent film is used as it is as the film base, the entire display part is always completely transparent through the surface protective layer, and after the surface protective layer is peeled off, the opaque background is in the matte background. The display pattern of the transparent area is formed so as to be seen through the film substrate.
[0011]
In addition, if a film on which a vapor-deposited film of metal such as aluminum is formed on the back side of a transparent film base is used, the entire sheet always exhibits a uniform metallic luster through the transparent film layer. In addition, after the surface protective layer is peeled off, a display pattern generated by comparing the transparent metallic color in the transparent area with the matte metallic color by sandblasting in the opaque area is obtained.
[0012]
When the surface protective layer is composed of a transparent surface protective film and a covering and bonding layer formed by bonding a thermoplastic resin between the surface protective film and the film substrate, the protective film is an ordinary resin. It is formed from a film or any other material, for example, a transparent thermoplastic resin material having the same quality as the film substrate. The back surface of the protective film is preferably subjected to an anchor coat or corona discharge treatment in order to enhance adhesion to a thermoplastic resin such as polyethylene which is supplied in the molten state and constitutes the coating bond layer. .
[0013]
The laminated display sheet of the present invention is attached to the opening of a chemical case as an adherend, for example, via an adhesive layer, and used as a seal for preventing unauthorized opening. It is done. The seal before opening appears to be transparent as a whole including the surface side to the film base as described above, and when the unauthorized opening is attempted, only the surface protective layer is peeled off and the film base remaining in the opening portion is removed. A display caused by the difference in appearance between the opaque area and the transparent area appears to clearly indicate that there was an act of opening.
[0014]
In addition, even if the surface protective layer is re-adhered to the film substrate by pressure sensitive adhesive or heating from this state, perfect adhesion as at the time of manufacture cannot be obtained, so fogging and wrinkles occur and the original completely transparent state is restored. Is difficult and reveals that there was tampering.
[0015]
The display laminated sheet of the present invention is generally constructed in the order of a film base material-surface protective layer (or covering bonding layer + surface protective film) having a display portion as seen from the adherend side as described above. The order of the layer structure is reversed, the layer corresponding to the surface protective layer is adhered to the adherend side, and the layer corresponding to the film substrate having the display portion on the surface side is detachably bonded. May be. In this case, even if an attempt is made to peel the entire laminated display sheet provided on the surface of the adherend for the purpose of falsification, the peel always occurs between the film base material and the protective layer, and the adherend is protected. When the protective layer is made of, for example, soft polyethylene as described above, it is almost difficult to completely remove the protective layer from the adherend, and the intention of falsification cannot be achieved.
[0016]
In addition, if the indication that appears on the film substrate after peeling is given as a predetermined symbol or number, the film substrate is peeled off from the surface of the adherend (metal can, etc.) after peeling off the surface protective layer, and the adhesive on the back of the substrate It can also be used as a coupon seal or lottery ticket that is attached to a postcard or the like by layer and mailed for exchange.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
In a preferred embodiment of the laminated display sheet of the present invention, as shown in FIGS. 1A (sectional view) and FIG. 1B (plan view), the film substrate 1 is made of a polyethylene terephthalate film having a thickness of about 25 μm. An opaque region 2 having fine irregularities is formed on the surface of the polyethylene terephthalate film 1 by sandblasting. In this region 2, the original transparency of the material is lost due to fine irregularities on the surface as shown in the figure, and the entire appearance of the matte tone is exhibited.
[0018]
A pattern such as an arbitrary pattern, number, character or the like is printed on a part of the opaque region 2 with a transparent resin ink made of a polyester acrylate resin. As shown in FIG. 2A and FIG. 2B, unevenness due to sandblasting in the opaque region 2 is smoothly filled with a transparent ink resin by this printing, for example, the region 3 indicated by the symbol (X) becomes transparent, and the surface is matte. A transparent region 3 displaying a predetermined pattern (X) in contrast to the tone-opaque region 2 is formed in a state where the mat-like base is transparent.
[0019]
As shown in FIGS. 3A and 3B, a protective film 5 having a thickness of 25 μm made of transparent polyethylene terephthalate was opposed to the surface of the film substrate 1 on which the display pattern was formed in this manner. In this state, a coated bonding layer 6 having a thickness of about 15 μm made of transparent polyethylene having a melting point lower than that of the polyethylene terephthalate of the film substrate 1 is interposed between them at a temperature of about 300 ° C. from a normal hot extrusion die. It supplies in the state melt | dissolved, the laminated display sheet which consists of a film base material-coating bonding layer-protective film is formed, and this is pressure-bonded by cooling.
[0020]
Here, the back surface of the surface protective film 5 is preliminarily coated with an anchor coat (not shown) made of polyethylene, and the polyethylene resin of the melt-extruded coated bonding layer 6 is connected to the anchor coat. It adheres by compatibility and adheres firmly to the protective film 5. On the other hand, the melting point is higher than that of polyethylene, and the base film 1 made of polyethylene terephthalate which does not enter a molten state at this temperature is detachably bonded.
[0021]
As described above, in the present invention, the surface of the sand-blasted film substrate 1 is made opaque by the roughening, and the transparent region 3 is made transparent with a transparent printing ink of a predetermined pattern (X). Is formed by the coating bonding layer 6 made of molten polyethylene supplied between the film substrate 1 and the protective film 5 during the production of the laminate. The film is uniformly filled and uniformly transparent with the transparent region 3, and a transparent protective film 5 is present thereon (FIG. 3A). Therefore, in this state, the display formed in the transparent region 3 of the film substrate 1 is latent, and the laminated display sheet exhibits a transparent appearance as a whole (FIG. 3B).
[0022]
In a more specific embodiment of the present invention, as shown in FIGS. 4A and 4B, the laminated display sheet is attached to the back surface of the film substrate 1 on the adherend (car) via the pressure-sensitive adhesive layer 7. Pasted on the surface of the base material 8). In the display area 9 on the adherend surface, predetermined items are printed as necessary. As described above, the laminated display sheet is transparent on the entire surface as described above. Therefore, the display area 9 of the adherend 8 can be completely seen through in the same manner as when a normal transparent laminate is applied. it can.
[0023]
If the laminated display sheet is peeled off from the adherend 8 with this, the polyethylene resin of the covering and bonding layer 6 is peeled off from the film substrate 1 integrally with the back surface of the protective film 5. The surface of the sheet is again in the state shown in FIGS. 2A and 2B. In this case, since the peeling is performed very smoothly and with a relatively small peeling force, the polyethylene resin of the covering bonding layer 6 is completely removed without damaging the fine irregularities due to sandblasting in the opaque region 2 and formed on the surface thereof. The matte appearance is restored. Therefore, the display pattern (X) due to the contrast between the opaque region 2 and the transparent region 3 can be seen again on the surface of the film substrate 1 exposed by peeling.
[0024]
When the laminated display sheet shown in FIG. 4 is used as a tamper-evident seal, the sheet in a normal state in which the seal is attached to the adherend 8 via the pressure-sensitive adhesive 7 is used. The surface of the screen is transparent as a whole, and the display pattern formed in contrast to the opaque region 2 and the transparent region 3 of the display is invisible because it is uniformly transparent as a whole. If the seal is peeled off improperly or mistakenly, the opaque region 2 and the transparent region 2 are made transparent on the surface of the film substrate 1 left after the surface protective layer made of the protective film 5 and the covering bonding layer 6 is removed. A display pattern (X) by comparison with the region 3 appears, and it becomes clear that the seal has been opened carelessly (state shown in FIG. 2). In addition, after peeling, neither the surface side of the film substrate 1 nor the back side of the coating / bonding layer 6 is tacky at all. Therefore, after the surface protective layer 4 is peeled off, it can be returned to its original state. It is impossible, and even if the surface protective layer 4 is again adhered to the film substrate 1 by means of a transparent adhesive or heating, sufficient uniform contact as in the production cannot be obtained. In particular, it is difficult to restore a completely transparent state in the sandblast portion, and turbidity and cloudiness are generated, and the trace of opening becomes clear.
[0025]
In the above embodiment, an ordinary transparent film is used as the film base so that the entire laminated display sheet is transparent so that the surface of the adherend can be seen through. In the case of a coupon or lottery that does not need to be formed, a metal vapor deposition film 10 such as aluminum as shown in FIG.
[0026]
In this case, the surface appearance of the transparent film usually shows a silvery texture due to the aluminum vapor deposition film on the back surface, but in the opaque area 2 by sandblasting, the transparent gloss is suppressed and the texture of the silver is erased, and the transparent ink is printed. In the transparent region, the display can be obtained by comparing the state of the silver luster.
[0027]
In the layer structure of FIG. 5, a display unit such as a score is formed inside the seal attached to the product, and the purchaser collects this seal and uses it for exchanging it for a prize. This also applies to In this case, peel off the film from the surface of the adherend such as a metal can after confirming the display of the score of the film substrate that appears by peeling, and use the adhesive remaining on the back side of the substrate to remove the seal for postcards. It can be pasted and mailed for exchange.
[0028]
In another embodiment of the present invention, the order of the layer configurations may be reversed. That is, as shown in FIG. 6A, the polyethylene terephthalate film 11 having the opaque / transparent regions 12 and 13 is used as a surface layer to be peeled, and the bonding layer 14 made of soft polyethylene is applied to the adherend 18 with an intermediate pressure property. You may comprise so that it may stick by the adhesive bond layer 17. FIG. In such a layer structure, for example, even if the entire laminated display sheet such as a label attached to the adherend 18 is to be peeled off from the adherend 18 for the purpose of falsification, the soft polyethylene side is always attached to the adherend 18. Since it remains and does not peel easily, tampering is reliably prevented.
[0029]
【The invention's effect】
According to the present invention, the opaque region 2 is formed on the surface of the film substrate 1 by sandblasting, a part of this region is smoothed by printing with transparent ink, and the transparent region 3 is formed. Since the opaque region 2 is made transparent by covering with the surface protective layer 4, the laminated display sheet always exhibits a transparent appearance due to the material of the film substrate 1.
[0030]
When the surface protective layer 4 is peeled off, a display appears on the sheet surface that has been seen to be uniformly transparent until then due to the contrast between the opaque region 2 and the transparent region 3 on the film substrate. Therefore, the present invention can fulfill its practical function by being applied as, for example, a package seal for preventing opening or a coupon or a lottery ticket.
[0031]
The laminated sheet of the present invention is a simple process in which a predetermined transparent pattern is printed on a sandblasted film, and a surface protective layer is laminated thereon using, for example, an ordinary laminator. Since it is obtained, it can be manufactured very easily.
[Brief description of the drawings]
FIG. 1A is a cross-sectional view showing a sandblasted film substrate used in a laminated display sheet of the present invention.
FIG. 1B is a plan view showing a sandblasted film base material used in the laminated display sheet of the present invention.
FIG. 2A is a cross-sectional view showing a display unit obtained by forming a transparent region in a part of an opaque region of the sandblasted film substrate.
FIG. 2B is a plan view showing a display unit obtained by forming a transparent region in a part of the opaque region of the sandblasted film substrate.
FIG. 3A is a cross-sectional view of a laminated display sheet in which a surface protective layer is formed on the opaque region and the transparent region.
FIG. 3B is a plan view of a laminated display sheet in which a surface protective layer is formed on the opaque region and the transparent region.
FIG. 4A is a cross-sectional view of a tamper-evident seal using the laminated display sheet.
FIG. 4B is a plan view of a tamper-evident seal using the laminated display sheet.
FIG. 5 is a cross-sectional view of a co-op seal as another specific example of the laminated display sheet.
FIG. 6A is a cross-sectional view of a co-op seal as another specific example of the laminated display sheet.
6B is a cross-sectional view showing a state after the seal of FIG. 6A is peeled off.
[Explanation of symbols]
1 Film substrate (PET)
2 Opacification area (sandblasting)
3 Transparent area (transparent ink printing process)
4 Surface protective layer 5 Surface protective film (PET)
6 Coated bond layer (PE)
7 Pressure-sensitive adhesive layer 8 Substrate (card)
9 Card surface display area 10 Aluminum vapor deposition layer 11 Surface side film (PET)
12 Opaque area (sandblasting)
13 Transparent area (transparent ink printing process)
14 Coated bond layer (PE)
17 Pressure-sensitive adhesive layer 18 Substrate

Claims (6)

  The surface of the film substrate 1 made of a transparent thermoplastic resin is subjected to a roughening treatment such as sandblasting to form an opaque region 2, and a transparent resin ink is applied to a part of the opaque region 2 with a predetermined pattern. The transparent region 3 is formed by printing the surface to make the rough surface smooth, and a transparent thermoplastic resin having a melting point lower than that of the film substrate 1 is supplied to the surface of each of the regions 2 and 3 in a molten state. Then, a method for producing a laminated display sheet comprising cooling and solidifying to form a surface protective layer 4 releasably bonded to the film substrate 1.   A transparent region 2 having an opaque region 2 formed by roughening treatment such as sandblasting on the surface and a transparent region 3 formed by printing a transparent resin ink in a predetermined pattern on a part of the opaque region 2. A film base 1 made of a thermoplastic resin, and a surface protective layer 4 formed by bonding a transparent thermoplastic resin having a melting point lower than that of the thermoplastic resin of the film base 1 to the regions 2 and 3 in a peelable manner. A laminated display sheet that potentially incorporates a display portion produced by contrast between the opaque region 2 and the transparent region 3 on the surface of the film substrate 1. The laminated display sheet according to claim 2, wherein a metal vapor-deposited film is previously formed on the back surface of the film substrate 1 .   The laminate according to claim 2, wherein the surface protective layer (4) is formed by detachably bonding a transparent thermoplastic resin having a melting point lower than that of the thermoplastic resin of the film substrate (1) to the regions (2) and (3). Display sheet.   The surface protective layer 4 is a transparent surface protective film 5 and a transparent thermoplastic resin having a melting point lower than that of the thermoplastic resin of the film base 1 is bonded between the film base 1 and the surface protective film 5. 3. A laminated display sheet according to claim 2, comprising a coating bonding layer 6 formed as described above. The laminated display sheet according to claim 2 , wherein an adhesive layer 7 is formed on the back surface of the film base 1 of the laminated display sheet.

Images